What prevented european from exploring the world sooner during the middle ages?

According to thorstein veblen, a successful businessman would be most likely to demonstrate his worth to others by:

Abadger lives in oak grove forest. it is a female and it is four years old. which of the following animals could be considered a member of this badger's population? a. a two-year old male red fox living in oak grove forest b. a ten-year-old female skunk living in pine warden forest c. a four-year-old female badger living in a zoo d. a ten-year-old male badger living in oak grove forest

What important race leader of the early twentieth century is being described?