Answer:
Vietnam War
Inflation
Watergate
Step-by-step explanation:
Out of these choices, the above three are correct.
Nixon's biggest domestic issue was pursuing the Vietnam War; although the other two are rather pertinent. Watergate was a significant scandal.
However if you have this same question and it has the option 'liberal supreme court' available, that is another issue Nixon struggled with. He opposed liberalism because of how it affected society back then.
Hope it helps.