Why did the early Americans settle down in permanent dwelling?

The first people were not nomadic. They came from West Europe. They were either criminals or pilgrims looking for religious freedom. They knew how to farm so they set up small farms and ports along the coast. For these reasons, they would have no reason to drift from home to home.

Also

I'm not sure if this is what your asking but the early Americans travelled great distances from many different countries. This meant that due to the few number of boats travelling to america, not enough resources were ported across to America meaning that it would have been hard to get very far. That is why small villages were set up near the coastline of america.

If you mean the reasons for leaving there own countries and going to america you might want to have a look at this website