Technological advancements such as the compass, astrolabe, and caravel contributed to the

to the exploration and travel to the world

richard nixon led the investigation that resulted in alger hiss being convicted of prejury.

president franklin roosevelt supported the tva as part of his first new deal measures approved by congress in 1933. this new agency was designed to control floods, produce electric power, and improve the lives of people living in the tennessee valley. the tva accomplished many of these goals despite problems.