How might a surplus of food have civilizations advance from huntergatherer societies

Which of these was a cause of the war of 1812? a) french troops would not leave canada. b) spanish forces threatened to invade florida. c) british ships cut off american trade to europe. d) king george iii supported the confederate states.

What event brought the us into wwii? what conflicts happened after the us entered the war? i know the first part of this question, i need with the second part.

One of the person important products for britain's manufacturers was