Connecticut's major employers over the years in manufacturing of that sort has been General Dynamics' Electric Boat Division (no commercial customers), Sikorsky Helicopters (hardly any commercial customers), and Pratt/Whitney America Aircraft Engines group (which does have commercial business, primarily improvements and upgrades to the JT-9, but has been doing a lot of government development work lately that used to go to Vero Beach).
If "manufacturing" is going anywhere in the U.S., it's mostly based on building either government products, or building ITARS protected commerical (i.e., dual use) products.
Everything else that can be built elsewhere and imported back into the country tariff free will be because if it isn't, someone else will do it and undercut you in price. Since the U.S. provides little protection for it's own goods, and in fact subsidizes the foreign goods, the end result is that commerical production will usually be forced to go offshore.
Want a job? Get a clearance, and lobby the Congress to spend money in your district. It's the American way. Just ask Boeing/LockMart/GD/Raytheon/Textron.
"Want a job? Get a clearance, and lobby the Congress to spend money in your district."
Or, "gasp", move to a district where the jobs are.