The answer is FDR'S New Deal
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After the stock market crash, the New Deal is what grew the economy and put everyone back to work.
He trained rats in the correct route through a maze,then deliberately damaged their brains and observed that this did not inhibit their progress through the maze.
Countries would want to keep or make nuclear or bio weapons to become world powers or have the upper hand against other nations without that kind of power
Trade, religion, colonialism, exploration
It was a farmer named shay that started the rebellion.
