Yes, the "A" in American should be capitalized when referring to the nationality or cultural aspects of the United States. So it should be "American customs."
Africans kept many customs and beliefs from their homelands. These customs and beliefs became the basis of African-American culture.
Some symbols of the United States are the Bald Eagle and the American flag.
They look a lot like alchemy symbols.
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American missionaries in China adopted some Chinese customs.
american flag, penny, and the nickel
Kansas has many official state symbols. A few of the state symbols are the American buffalo, honeybee, cottonwood, and the western meadowlark.
Information about Native American signs and symbols can be found at the Whats Your Sign website. It has a detailed listing of signs and symbols that were used by Native Americans as well as variations that were used by several different tribes.
The American bald eaglethe American flagthe declaration of independence
The 13 colonies.