As far as I know, there are 2 river that flow north...?

There are an enormous number of rivers which flow north, all over the world - including some of the largest of them all - the Nile, the Yenisei, the Ob, etc.

They don't. It's a myth.

Much of the US east of the Rockies has landforms that flow generally to the south, so such rivers aren't common in that area. But as far as the rest of the world goes, many rivers flow north. Besides many smaller rivers that do so in the US, there are major rivers in Alaska, Canada, and Russia that flow generally north.

That is the downhill direction

Also the Cuyahoga in Cleveland flows North.

The Nile in Africa flows north.

Must be going downhill. That is what determines which way the water flows isn't it?

Give the land back to the natives you European invader.