What reasons and ideas led some groups to seek out trade and interactions with outsiders while some groups practiced policies of isolationism

The continents of africa and south america used to "fit together” like puzzle pieces. about how far back in time would you have to go to find the formation of the atlantic ocean? 600 million years 430 million years 200 million years 90 million years

The idea that desirable traits can be bred into human beings and undesirable ones can be bred out is known as:

How is government in the united states like that of ancient athens?