The national independence of formerly colonized countries became Cold War conflicts because both the United States and the Soviet Union sought to expand their sphere of influence and gain allies during the Cold War. Many of these newly independent nations were politically and economically vulnerable, and both superpowers saw this as an opportunity to gain an advantage over the other.
The United States and the Soviet Union competed to provide aid, military support, and ideological influence to these newly independent nations. The United States favored capitalist and democratic governments, while the Soviet Union favored socialist and communist governments. This led to many proxy wars in which these superpowers supported opposing sides in conflicts in these newly independent countries.
In addition, the Cold War created a divide between the non-aligned movement of developing countries and the two superpowers. The non-aligned movement was a group of countries that did not align themselves with either the United States or the Soviet Union, and they were often caught in the middle of these Cold War conflicts.
Overall, the national independence of formerly colonized countries became Cold War conflicts due to the competition between the United States and the Soviet Union for influence and power during the Cold War.