What was America's initial policy regarding international affairs after WWI?

Which of the following is one of the innovations that neolithic farmers become more productive? a) plow b) windmill c) tractor d) reaper

Known officially as a parliamentary democracy, but sovereign to the united kingdom, which canadian official is the head of canadian government? a) the president of canada b) the prime minister of canada c) the governor general of canada eliminate d) the royal canadian mounted police

What were the death camps? who was sent there?