He was trying to claim he was no longer a slave because his master had taken him to states in which slavery was illegal.
They used what they industrialized to take over and fight other countries
<span>the states could not work closely with Congress is your answer</span>
He was a diff. color citizen and he made a speech after rosa parks (diff color) decided to refuse to give up her seat after a long day at work. So he made a " I have a dream" speech and later on he got assassinated in his house.