Why can the United States sanction any country, but not others?

Because the United States is the only superpower after the Cold War and has absolute advantages in economy, politics, military, and culture, and the American hawks now dominate the foreign political policy of the United States, he does not want to have Even if a country more powerful than him appears, he will not allow any country to harm him. The Iraq War after 9/11 is evidence of this. No big country will risk participating in a war to prevent the United States from sanctioning weak countries. This is the post-Cold War world pattern.