What are two theories about migration to the americas?

The first theory is the short chronology theory, which says that the first migration  happened after the Last Glacial Maximum, around 19 000 years before present.

The other theory says that America was settled much earlier, around 40 000 years ago- this is called the long chronology theory.

1. Punjab

2. Sind

3. Gujarat

4. maratha

Hope this helps :)