Modern western culture is all about capital. It is called Capitalism for a reason, but it really started out about 200 years ago when the industrial revolution kicked off. Growth rates boomed, jobs for thousands outside of agriculture, and a new class of wealth powerful people appeared. Not the previous land owners who kept up a steady income from rent/farming.
They could build their wealth in trade or banking, and then invest in capital projects, railways and factories. The US followed a very different route than the UK - which very quickly exploited all the low lying fruit and cover the UK in rails... The US invested inward while the UK decided they could make money from building rails in the colonies, in China and India, across Australia and Africa. The had the capital, but nobody else had the money to pay, so the great British banking tradtion got sorted out and lent money to a variety of power. But since the needed to make sure they were paid back they needed a hand in local governance. So the British Empire expanded to influence and control economic decisions across the world in order to protect their capital investment.
Capitalism, trade and Imperialism all combined, in rder to explpit and extract resources from the 'less developed' cultures.
When the Germans, Americans, and Japanese got in on the gig it was little surprise that war erupted, because they were all competing for being the ones to exploit the most, the fastest.
Nothing particularily noble about our cultural heritage. Americans colonised the continent, invaded Hawaii and Puerto Rico, and Cuba? Took Alaska from another Imperial power, and eventually defeated Imperial Japan to dominate the Pacific. (And took Panama to make sure their fleets could connect between the Atlantic and Pacific) All the behaviours you expect to see from a Capitalist Imperial Nation.