Which of the following nations has the most political divisions within it?

a. United States
b. Dominican Republic
c. Mexico
d. Canada

a. United States

To determine which of the listed nations has the most political divisions within it, we can look at the subdivision levels or administrative divisions in each country. Here is a breakdown of the political divisions for each country:

a. United States:
The United States is divided into 50 states, plus a federal district (Washington, D.C.).
Total: 50 states + 1 federal district = 51 political divisions.

b. Dominican Republic:
The Dominican Republic is divided into 31 provinces and the National District (Santo Domingo).
Total: 31 provinces + 1 national district = 32 political divisions.

c. Mexico:
Mexico is divided into 32 states and a federal district (Mexico City).
Total: 32 states + 1 federal district = 33 political divisions.

d. Canada:
Canada is divided into 10 provinces and 3 territories.
Total: 10 provinces + 3 territories = 13 political divisions.

Based on these subdivisions, the nation with the most political divisions is the United States (option a) with 51 political divisions.