John f kennedy signed the declaration of independence and made them free
He was the prinipal cheif of the cherokee nations from 1828-1866
Both are apart of north America.
First option (a.) is correct answer.
Hope it helped you.
-Charlie
After he learned of it, he was not afraid that was motivated in the sense that he pushed "The World" to publish his writing. He still continued his decision and with high hopes, he wanted to change the view of the world through his findings and study in Physics.