I wouldn't say that all governments of all time were tyrannies. Some were certainly worse than others, but I'm unaware of any government that didn't at least do something tyrannical. I wouldn't call our US government a tyranny, but it certainly does many tyrannical things.
Is the Constitution a tyranny? I'd say not, but there have certainly been tyrannical aspects to it. The clauses supporting slavery were certainly tyrannical; they were wiped out by the 13th Amendment. the 14th Amendment was quite tyrannical to the southern states after the Civil War, but after all this time the tyrannical portions are no longer relevant. The 18th was certainly tyrannical, but it was repealed by the 21st. I would argue the 17th is tyrannical, since it takes away the representation the states had in Congress. The 16th certainly is, and is really the only part of the Constitution that allows the government to directly restrict the people.
It's a continuum, not a black-and-white thing.