I believe the answer is: Old immigrants often had property and skills, while new immigrants tended to be poor, unskilled workers.
The old immigrants came into united states when it's still consist of mostly empty land, so people who dare to come here were tend to be highly skilled individual who understand how to operate businesses and they help in building United States to the super power that it is today
The new immigrants came into united states when it already rich and has one of the highest standard of living in united states. Even though this not applicable to all immigrants, it is a fact that rich nations often attract many unskilled workers since the standard of living of 'poor' people in united states can be higher than the standard of living of 'middle class' people in non-developed nation.
Choice C. He gained US support and persuaded the US government to help his people. This best explains how Ya-sir Arafat strengthened the case for Palestinian independence.
