What isolate ancient india from the rest of the world

Why did roosevelt support a “europe first” strategy even though it had been japan that had first attacked the united states?

What is the relationship between the supreme court and the lower courts? the supreme court must abide by the decisions of the lower courts. the supreme court appoints judges to the lower courts. the supreme court can overrule decisions made by the lower courts the supreme court can impeach judges from the lower courts.

Who were the people that migrated south into india and indus valley