The Dred Scott Supreme Court case ruled that slaves are property and are allowed in all states/territories, even if slavery is outlawed in the state constitution.
This idea supports the concept of nullification, as states that abolished slavery would nullify (refuse) to follow this ruling because they felt it was unconstitutional.
This idea also limited the power of the federal government to restrict the expansion of slavery because the court ruled that slaves do not have legal rights and are considered property no matter where they go. This meant that slavery can essentially exist anywhere in the US and the federal government couldn't change that unless they made a national law/amendment that outlawed slavery.
Hey there!
The answer to your question is: Ratification
Ratification is when we confirm something officially.
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Having polio Roosevelt realized just how easlily life can be lost. This changed the way he though of certain things such as politics.
He made programs to help people medically. This things were part of the New Deal. He made medical care more affordable and accessable.
As far as his personality changing he bacame more appreciative of life. Polio could've taken his life, and he realized that. He didn't want to take life for granted.
League failed in it's main object of maintaining peace in the world. Inspite of it's efforts for two decades, the whole world was involved in a war in 1939. By that time, the machinery of the League of Nations had completely broke down. The failure of League of Nations can be attributed to many causes.