배치고사 영어 지문 해석 부탁드려요

아래 글 해석 부탁드려요.
“Usually, nature makes the borders of a country. Rivers or mountains divide one country from the next. That was the way borders were made for thousands of years in Africa.
But Europeans did it in a different way.
They agreed to draw straight lines to decide many of Africa’s borders. Sometimes they just stayed in Europe and divided Africa by looking at a map. These decisions were very tragic for Africa. People who did not share a common language or culture were forced to live next to each other.”