3. what kept the peace in europe until 1914 despite the rapid buildup of armies and weapons?

a. a system of military alliances that divided europe into two camps

b. a system of peace treaties that invoked harsh penalties for aggressor nations and their allies

c. the knowledge that if any one nation declared war on another, all nations would rise against the aggressor

d. the introduction of new weapons and methods of warfare that made war hard to win

while it was true that the cotton gin reduced the labor of removing seeds, it did not reduce the need for slaves to grow and pick the cotton.

explanation:

before eli whitney's invention of the cotton gin, picking and cleaning cotton was a slow, labor-intensive job. workers, usually slaves, had to pick the seeds from the cotton fibers by hand. this invention made it possible to grow large amounts of cotton on big farms and make money.

that would be the steamboat because none of the other things are forms of transportation