One reason why groups of Native American Indians often developed different cultures was
that each group

Adapted to it's environment in a different way.

Explanation:

The development of human culture is linked to the geographical environment in which they live. This evolutionary aspect allows the human race to adapt to different environments over time and around the world.

The geography in North America is very diverse; from the great plains to swampy areas, and great mountains, they allowed very diverse cultures to develop throughout America.  

These cultures are different because they adapted to their environment, and also because of the geographical separation in which they developed.

I hope this information can help you.

a peace conference held after the surrender of japan

an international conference held near the end of world war ii

a meeting of the victorious nations after the defeat of germany

a summit meeting between the united states and the soviet union

general allotment act (dawes act) february 8, 1887

amendment to the dawes act, february 28, 1891

commission to the five civilized tribes (dawes commission), march 3, 1893