Why Doesnt All The Global Space Agencies ( USA China Nigeria Kenya India Japan Brazil Uk Russia) Joint Venture For The Goodwill Of Humanity?

Rather than just sending up satellites why not joint venture on human space activity as well ? After all humans have yet to get to Mars

2020-09-06T05:21:41Z

Yes Robin its called the ISS but so far no Chinese Indians Japanese have gone there ! 

2020-09-06T05:23:40Z

Ok Miguel so if thats true how come theres a delay to get back to Mars then ?

ALABAMA JEFF 692020-09-06T05:17:51Z

They do already.
How do you think Americans got to the International Space Station before the last Space X mission? 
And why do you think it's called the International Space Station?