There were a number of points which critics used to prove that the United States was working on establishing a new global empire:
1. The United States attacked Afghanistan even though the attackers of 9/11 were Egyptians and Saudis
2. An almost subsequent war in Iraq, which again, had nothing to do with 9/11
3. The fact that the United States has been in constant war since 9/11 with 240,000 personnel in active duty/reserve in 172 countries.
4. The US maintains 800 military bases around the world
5. America's continuous issues with Russia, Syria, Iran, North Korea
6. An ever expanding military budget
Supreme Court decision of Brown v Board of Education in 1954
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