It's just free markets in action. Finland is a small country that depends on international trade. Industries must remain competitive or go out of business. Unions that harm the competitiveness too much won't survive in the long term.
US domestic market is much larger. Uncompetitive industries can survive on domestic demand. Especially with some regulations that help. It doesn't even have to be explicitly protectionist regulation. Just regulate things the way Americans consider the best, instead of adopting international standards. That can create sufficient barriers to entry to allow uncompetitive industries and uncooperative unions survive.
US domestic market is much larger. Uncompetitive industries can survive on domestic demand. Especially with some regulations that help. It doesn't even have to be explicitly protectionist regulation. Just regulate things the way Americans consider the best, instead of adopting international standards. That can create sufficient barriers to entry to allow uncompetitive industries and uncooperative unions survive.