explain how the alliance system involved countries with no other national security interest involved.

The alliance system, particularly during the early 20th century leading up to World War I, primarily involved countries forming mutual defense agreements with other nations that shared similar national security interests. However, it is important to note that not all countries involved in these alliances necessarily had a direct national security interest at stake. Let's explore how this happened.

1. Balance of Power: The concept of the balance of power played a crucial role in the formation of alliances. In order to maintain stability in the international system, countries sought to align themselves with stronger nations to counterbalance potential threats from other powerful countries. Even if a particular nation didn't have an immediate national security interest, they joined alliances to safeguard their broader geopolitical and strategic interests.

2. Economic and Trade Considerations: Economic ties and trade relations also influenced the formation of alliances. Countries often sought to protect and expand their economic interests by aligning themselves with countries possessing valuable resources or markets. This desire for economic advantage acted as a driver, even if there wasn't a clear-cut national security interest at stake.

3. Ideological Affinities: Some alliances were formed based on shared ideological affinities rather than immediate national security concerns. For example, during the Cold War, the North Atlantic Treaty Organization (NATO) was created to counter the perceived threat of Soviet influence in Europe. While not all NATO members faced an imminent security risk, they joined the alliance due to shared democratic values and the desire to oppose Communist ideology.

4. Geopolitical Considerations: Geopolitical factors, such as territorial disputes or historical animosities, could also lead countries to join alliances even in the absence of direct national security interests. For example, the Triple Entente that formed before World War I between France, Russia, and the United Kingdom initially emerged from concerns regarding Germany's growing power and territorial ambitions.

Overall, while national security interests drove many countries to form alliances, other factors such as the balance of power, economic considerations, ideological affinities, and geopolitical factors also played significant roles. These factors prompted countries to seek alignment with other nations that may not have posed an immediate security threat but had broader strategic significance.