After entering the 19th century, the world's polarization became increasingly severe. "The strong became stronger, and the weak weaker," and the international landscape underwent a tumultuous change.
Old empires seized the opportunity from the Industrial Revolution, preemptively occupying a plethora of resources and began suppressing newcomers for their own interests.
The involvement of the United Kingdom and Austria this time seemed to be aimed at containing the expansion of France, but in reality, it also marked a collision between new and old imperialist nations.
Not every country is like the United States, with rich resources and markets on its homeland. Emerging nations aiming to rise would invariably need to grab sufficient resources and markets, and therein lies the conflict between the old and the new empires.