No. All interstates in the United States have speed limits that depend on the state you live in. Each state has a different maximum speed limit ranging from 60-80 mph. The only state with a speed limit of 60 is Hawaii and Utah is the only state with a maximum limit of 80. Texas is the only exception to the rule in that certain areas have their own rules ranging from 65-80 mph.
As codyrub says, it varies from state to state, but you may be interested to know that the reason you commonly see 55 miles per hour on signs is because the National Maximum Speed Law, which was largely ignored, but its effects remain in law (technically) even today. As part of the 1974 Emergency Highway Energy Conservation Act, it prevented speeds higher than 55 miles per hour nationwide. This law was drafted as a result of the 1973 oil crisis, but largely ignored by drivers. Check out its legal effects in the graphic below.
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