This is an odd question that just popped into my head. Do rivers tend to move more to the right or left? I know they run north to south (in the northern hemisphere) and south to north (in the southern hemisphere). But do rivers have a more leftward movement or more of a rightward movement? I know in Europe there are several rivers that run right to left (so they would have a leftward movement).

An example in the US would be the Mississippi River. It does this leftward arc before running mainly straight towards the Gulf of Mexico. But what about the Colorado River? I know the Hudson River goes mainly to the right.

Anyway - opinions? (And I know they all are trying to get to the coast line or maybe a major lake. I'm talking about the journey TO the coast line or major lake.)