Aprimary contributor to government spending under president reagan was great society social programs. high defense spending. increases to the departments of the interior and transportation. increases to school lunch programs.

High defense spending.

Explanation:

One of Reagan's most well-known acts was the escalation of the Cold War. Following the Afghan Saur Revolution, Reagan decided to increase government spending on defense. He ordered a massive buildup of the U.S. Armed Forces. He also created a missile program and oversaw the deployment of the Pershing missile in West Germany. Finally, he introduced the Strategic Defense Initiative.

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