<h2>
Answer:</h2>
<u>B) Border disputes and C) military groups overthrowing civilian leaders</u> have caused political unrest in the countries of the tropic north since they gained independence.
<h2>
Explanation:</h2>
Since independence tropical north countries have been unstable due to lack of strong governments and this lead to disputes among most of these countries. In Colombia, between 1946 and 1964 feuding political groups assassinated about 200,000 thousand people and instigated other violence attacks.
Furthermore, there we also rebel groups in the 1960's and 1970's making attacks throughout the country with the hope of overthrowing the government. Border conflict between Guyana and Venezuela which took place during colonial era. However, Guyana renewed the dispute which was only resolved in 2007. Other countries in constant battles include Peru and Ecuador, Ecuador and Colombia, Colombia and Venezuela, etc.
