A. Popular sovereignty
B. Federalism
C. Separation of powers.
D. Checks and Balances
Answer:
A. Popular sovereignty
Step-by-step explanation:
popular sovereignty is the idea that the people are the ultimate foundation or source of all political power. In other words, popular sovereignty means that the people are the basic driver and owner of the authority of government and all political powers and authorities are fully representative of them. This is demonstrated in the above, the president vetoes a bill and Congress counters and makes it law since authority does not solely belong to the president as he is but a representative of the people. Therefore chambers of Congress could vote on vetoed bill and if two thirds are in favour, congress overrides the veto and the bill becomes law