The answers are:
Meriwether Lewis, William Clark and Sacagawea
<span>After the U2 incident, Eisenhower believed it was necessary to employ a policy of brinkmanship against, </span>Nikita Khrushchev.
Bartholomew Diaz, who was sponsored by Portugal, had just rounded the tip of Africa. Ferdinand and Isabella were desperate to find a way to India (Asia) before Portugal. They were looking for a new way to get there faster.
Columbus had already tried to go to Portugal, but, as said before, Diaz had just rounded the Cape of Good Hope, so Portugal didn't want/need a new idea.
Hope this helps! Please let me know if I'm wrong :)
Maximilien de Robespierre was executed because of the things he did
during his lifetime. He was an important figure during the French
Revolution, as well as the Reign of Terror, which was a time of extreme
violence then. Robespierre executed many opponents himself, which is
something that was easy for him to do given his important role in the
society. Because of his evil doings, he was ultimately executed himself,
being the one who instigated the Reign of Terror.