Propping up our currency did not prop up our economy. It shit on our production/manufacturing while keeping Chinese goods cheap.
- propping up USA currency provided USA with a way to buy cheap Chinese produced goods. No, it did not prop up your economy, it propped up your consumption and it destroyed your economy. However the Chinese did not do this in vacuum, USA got off the gold dollar (defaulted on the gold dollar in 1971) because it was printing so many dollars for decades prior to 1971 and it could not pay in gold for its past spending.
USA destroyed its economy by destroying its currency. At the point of currency default (1971) the expansion of the money supply was set in stone. That is what destroyed USA economy. Common sense is not that common. Once USA destroyed its own currency, manufacturing was going to leave one way or another, since no real savings can exist in that environment.
China gave you plenty of rope to hang yourself with, you took the rope, wrapped it around your neck and kicked the chair of sound money from underneath yourself. The rope was Chinese, but you put it onto your own neck and kicked the chair out yourself.