Why does the us government enforce antitrust laws

Which statement best completes the diagram of the ways the different branches of government can limit each other's powers?

In the years after world war ii, which of the following caused many people from asian and african countries to migrate to europe? a. the end of the soviet union b. new economic opportunities after colonialism ended c. the religious freedom found in europe d. new laws allowing greater numbers of immigrants into european countries

Which of the following best summarizes the idea represented by this graph?