Conflict in the Early 20th Century, 1890–1945

The start of World War II could've seen a more proactive American involvement due to delayed neutrality stance.

Spanish Civil War could've concluded differently with a Republican victory over the Nationalists.

Pearl Harbor attack in 1941 would've been prevented.

Treaty of Versailles would have been ratified by the U.S. Senate.

They facilitated limited mutual understanding that would later underpin sporadic collaboration in World War II.

They led directly to a formal alliance against emerging fascist states prior to World War II.

They significantly reduced tensions culminating in a joint security pact disregarding ideological divides.

They prompted an immediate cessation of all diplomatic contacts due to irreconcilable differences.

Militarism

Imperialism

Isolationism

Interventionism

It promoted economic imperialism in Latin America.

It established military bases in Latin America.

It encouraged European colonization of Latin America.

It renounced armed intervention in Latin America.

Soviet Union would've disintegrated earlier than it did.

There likely would have been increased tension and resistance from Latin American countries towards the U.S..

The cold war would have started before World War II ended.

Japan might not have attacked Pearl Harbor in WW II.

The formation of the League of Nations after World War I

The global economic downturn caused by the Great Depression

The aggressive acts of totalitarian regimes during the late 1930s

Increasing isolationist policies in the United States throughout the 1920s

Encouraged domestic political support in Japan due to the perceived threat to sovereignty.

Non-recognition of territorial gains achieved through aggression, setting a precedent for non-interventionist responses to future acts of conquest.

Escalated direct military engagement to halt further expansions.

Increased collaboration to counteract imperialism between western powers in the region.

Global peace and self-determination for nations

Total isolationism from global affairs

A universal war reparations system

International aggression and territorial expansion

Maintenance of a non-interventionalist approach that avoids political and military entanglements abroad while focusing on neutrality legislation

Rejection of traditional isolationism in favor of proactive international leadership based on democratic ideals and economic influence

Affirmation of collective security measures to prevent conflicts through international organizations and treaties such as the League of Nations

Continuation of protectionist trade policies aimed at preserving domestic economic prosperity independent from foreign markets

The emergence of aggressive totalitarian regimes in Europe and Asia

The global shift towards decolonization and national independence movements

The aftermath of World War I and the impact of the Treaty of Versailles

The initiation of the Cold War between the United States and the Soviet Union