The final two lines are an example of repetition. I hope this helps:)
Between 1870 and 1920 some 11 million immigrants came to the United States. In Akron, the new ethnic groups began to make their presence known. They became part of the rising population of the city, which increased from 27,601 in 1890 to 42,728 in 1900 and reached 69,000 by 1910.
The death of Kublai Khan in 1259 marked a major turning point because up to his death, the Mongol Empire was more or less constantly expanding. However, with his death, things started becoming worse and worse eventually as the empire became to big for one emperor to hold it.
The Mongols gained power because they had a strong army. ... They consolidated power by winning over the Chinese by ruling in a traditional Chinese style and building dams and the Grand Canal. Kublai Khan built these water projects.
