No, you can’t do that.
If your side (but not necessarily your power) controlled a canal or narrow strait at the start of your turn, you may move
sea units through it (you can’t use it in the same turn that you capture it).
Before you know it, every territory will have a Airbase / Minor / Navalbase, There will be more political rules than ever, and victory conditions will be reduced to “play until someone else gives up.”
I couldnt agree with you more.