People who leave their countries because the land had been settled.
<h3>What is a frontier?</h3>
A frontier is the area of Land that is shared by two countries.
It is the border or outskirt of the country which can be occupied by people form the various country. People move here in war time or to search for greener pastures.
Therefore, People moved to the frontier because the land had been settled.
Learn more on frontier here,
brainly.com/question/24693743
Assuming that this is referring to the cartoon that was posted before with this question, the correct answer is "<span>(2) Booker T. Washington". But it took other forms as well. </span>
The triangle shirtwaist factory fire