The American work force grew in the 1800s because industrialization created new jobs. ... There were no child labor laws, factories needed as many workers as they could get, families needed as much money as they could get, and children had smaller fingers and hands, making them ideal for some more precise jobs.
<span>Suspected political opponents were jailed or executed.</span>
In 1931 Japan invade Manchuria which is a region in northeast Asia
