Which of the following is the main basis for the division of political units in europe

Differences in the form of government

Explanation:

The main basis of political division of the European nations is widely based on what form of the system of governance each of the country follows.

Thus, some countries favour Republic type of government, such as France, Estonia, and Crotia, some others favour Federal Republic such as Germany, and some favour Constitutional Monarchy such as United Kingdom, Spain, and Belgium, some even adhered to Socialist republic or Communism such as Albania.

Hence, in general and simple approach, the form of government in which the Western European Nations maintained democratic form of governace, and majority of the Eastern European Nations favours Communism, serves as the main basis of political division in European Nations.