What issue was the presidential campaign of 1920 dominated by?

A. Immigration

B. The economy

C. America's role in world affairs

D. Obamacare

The 1920 presidential elections of the USA were dominated by the subject of America's role in world affairs.

Option C

Explanation:

During this period, the country had joined the organization ''League of Nations'' which was formed to maintain peace in the world, under the presidency of Woodrow Wilson. While, the nation was suffering from worker's strikes, recession, and racial riots. The incumbent president Woodrow Wilson faced challenges as he was perceived to be more focused on world affairs.

However, the presidential candidate Warren Harding managed to gather people's trust by his ''return to normalcy campaign'' where he spoke about normalizing the situation in America and the world, which lead him to win the 1920 election.

I do believe the answer is immigration