Answer:
ok so not personally but my dad has been called "old" lol hes 51
I would have to say during the industrial revolution. Many new inventions were being made and America started taxing goods being shipped to other countries. To remove taxes from certain countries, they moved factories to other countries so avoid Tariffs. It wasn't the colonization of America because America wasn't a country yet. It wasn't the reconstruction or world war 2 because the factories were already there from the industrial revolution.
Hope I helped!
Answer: because the industrial states only take care of themselves and don't care about developing states growing around them, and if theres no benifit for the industrialized states if they do help then there is no point.