Answer:
False.
Explanation:
The allies allowed Hitler to annex much of Western Europe before acting. Only after Germany's joint invasion of Poland with the Soviet Union did they join the war.
Mount Everest is the biggest mountain in the world.
The cotton gin made it easy for slaves to separate seeds out of the cotton. However, it it increased slave usage all over. It actually increased the use of slavery. The cotton gin just made one part of a slaves job quicker and easier.