Do white Americans worry about becoming a minority in their own country? ?

Yes, to answer your question, white people, or more specifically Anglo-Protestants, are worried about becoming the minority or more of a minority. Yes, it was Anglo-Protestants who developed the structure of this country and yes the country will change as a result of conflict between the different cultures of the USA. We could go the same route as Yugoslavia, but we might break apart into separate countries, as styled by Malcom X, before this happens. 

Are you really from India? so people in India think that "Hispanic' is a race? do you guys also think that whites are native to the United States?

Why should anyone respect the opinion of an Indian or pretend Indian on a matter such as this, especially when you’re too ignorant to know the huge part black labor played in the wealth of America?

This is happening in Europe too.. If whites are not indigenous to America, they should at least have a homeland in Europe. But Europe is also being replaced at the same rate. The anti-white leftists in Europe promote the nonsensical idea that European countries are also “immigrant nations” to facilitate non-White takeover of Europe. The “nation of immigrants” propaganda has entered European countries.

 Strictly speaking, America belongs to the indigenous people who became a minority in their own country after waves after waves of migrants from different countries settled down here and overwhelmed them..How whites can claim that this is their land 

your a indian well you better learn mexican then , .

who cares, it's not that big of a deal.

I am a White American....thanks for caring about us. I figured out that people from outside America  have bribed people from inside America to weaken us as a nation by first allowing immigrants into America and not requiring them to assimilate to our cultural values and consider themselves the same nation as us, the way previous generations were required to assimilate...so as the older generations of Americans die off, the true Americans get fewer and fewer, which is alarming. Other steps include the promotion of sexual immorality from the late 1960’s onwards, so that marriages  (and ultimately families) would weaken and decay, and the rejection of our old moral values from the public square, so we would lose our way spiritually. And another step is to act like White people are born evil and unredeemable, that Capitalism is inherently evil and racist against all ‘P.O.C.’ because it was formed at the same time America was engaged in the twin tragedies of genecide of the land’s indigenous peoples and African slavery) and that White cultural values are all inherently racist. You as an Indian, probably know all these claims are B.S., because many of your fellow Indians are the same skin color as Africans, yet you guys come over here and are successful immigrants, by and large....if Capitalism was inherently racist, ONLY White people could succeed....yet the success of Indians, as well as other Asian peoples, and other ‘P.O.C.’ like Oprah Winfrey, blow that lie right out of the water. I’m not saying it’s a perfect system...and people who are evil abuse it so that it looks like it’s the system itself that is to be blamed...but it’s way better than the alternatives of Communism/pure Socialism and Facism, dictatorships and Authoritarianism!!!

People want America to fail because they want us out of the way so they can enslave the whole world with a worse government than Capitalism. May God above help America turn around before it is too late!! And may God increase the number of countries who have a fairer form of government, so that there be multiple “Americas” for people to turn to.

In at least three areas of the southwestern USA whites are no longer a majority, and haven't been for a lot of years. There doesn't seem to be any problem with this.

You don't seem to know much about US demographics OR history.  Let me help you out a bit.

First, Spanish-speakers are NOWHERE NEAR overtaking English-speakers, and won't be for a long, long time, if ever.  There are presently 330 million people in the USA.  Only about 60 million of those are "Hispanic".  "White" people?  About 200 million.

What's going to happen a bit before 2040 is that continued growth among non-whites (black, Spanish-speakers, Asian, natives, and others) will result in ALL those groups ADDED TOGETHER finally equaling the number of "white" people.  So for the first time, the people who have always exerted control (numerically or violently) of all the American legislatures will begin to lose it.  That is why you see one of the American political parties so frantically seeking to disenfranchise non-whites now.

As for white people building the USA, you are forgetting that, first of all, the "USA" was not theirs to build.  It would be as if the British exterminated the native population of India, moved in to the depopulated territory, mined its wealth, felled its forests, hunted its animals to extinction, demolished its temples and monuments, paved over its fields and rice paddies...and describing that by saying "The British "built" India".

You're also overlooking the fact that the English wouldn't have stayed in North America at all but for two reasons:  Tobacco, and Cotton.  And there wouldn't have been either of those things without African slaves.  Not to mention canals they were forced to build...and the roads and ports and cleared land...AND EVEN THE VERY BUILDINGS WE SEE ON TELEVISION THAT REPRESENT THE USA:  their Capitol and White House - constructed with slave labor!  The very foundations of the USA rest upon the bones of non-whites...millions upon millions of them.  And that doesn't even begin to address the glossed-over contributions of African- and Asian- and native-Americans to US warfighting and US prosperity across its entire history.

I hope this helps you grasp why it will be a benefit to white Americans to finally have to recognize that they are (and have always BEEN) simply one PART of a great number of contributors to their democracy.