I have to agree, not enough time. I travel internationally multiple times a year and NEVER book a connection with under 90 minutes and I have Global Entry. While it is theoretically possible to make an international connection in about an hour you have no wiggle room. A slight delay in take off, or having to wait for a gate to open or encountering a long line at TSA, or perhaps you get selected for a more thorough customs inspection and you will miss your flight.

Remember Murphy's Law of Air Travel clearly states the shorter your connection time the more delays you'll encounter.

Remember too, better to have an extra hour airport waiting time then to arrive at the gate for your connecting flight 1 minute after the plane leaves.