Answer:
Trying to prevent increasing tensions with Native neighbors
Explanation:
If colonists tried moving more west, natives could become disgruntled and attack colonists
The main change is the countries the immigrants were coming from. The immigrants in 1840s were coming from the Western Europe mainly Ireland and Germany. Immigrants from Asia and Eastern Europe were coming a bit later while during the beginning of the 20th century most of the immigrants came from Italy.
The best and most correct answer among the choices provided by the question is the first choice. <span>Urban planning helped many of the larger cities control the problems brought by rapid population growth. </span><span>I hope my answer has come to your help. God bless and have a nice day ahead!</span>
<span>Most historians believe early Native Americans crossed over the Bering Land Bridge from Asia to Alaska during the last Ice Age</span>