America became imperialist and wanted to gain some of the Spanish territory. Journalism helped start this off by saying the Maine had been exploded by the Spanish. The significance is that we gained Cuba, the Philippines, Puerto Rico,and Guam from the Spanish.
The annexation was a way to stop the Spanish during the Spanish-American War from spreading their empire. If they would've spreaded it would have posed a grave threat to the U.S.
The significance of the Open Door Policy, was that it proposed an open and free market for all interested nations with regard to trade with China. This allowed greater opportunities of improvement for the U.S.
The U.S. started a rebellion in the Colombian province of Panama by inciting nationalists to seek independence. The U.S. promoted this rebellion to ensure a deal from Panama for the Panama Canal. After the rebellion, the U.S. struck a deal with Panama for ownership of the territory surrounding this new canal.
This canal employed one-third of Central America and the Caribbean. It is also known that the US was heavily influenced by it and by the money that was flowing through the banks.
The purpose of the Foraker Act was to establish a limited government in the recently acquired territory of Puerto Rico. It's also stated that it granted Puerto Ricans partial US citizenship status.
This amendment essentially gave the US permission to intervene in Cuban affairs. The Platt Amendment was followed by the Cuban-American Treaty, which allowed the U.S. to lease land in Guantanamo Bay for a naval station.
It stated the right of the U.S to intervene in economic affairs of small countries in South America ,Central America or the Caribbean . Although the U.S would lend small nations money knowing they would not be able to pay back in order to take over them as a form of payment of use their sources.
The significance behind the Square Deal was to be fair to every citizen in the United States. To create this fairness, corporations and the average citizen had to be equal.
The significance was the end of the Qing Dynasty and therefore of the imperial system and Manchu rule in China. Within a few years, a strong Nationalist movement would depose the last emperor, with western approval, and establish rule by ethnic Chinese.
To calm tensions in the West Coast and Japan, the US. informally agreed to end Japanese emigration. Uncle Sam's end of the deal was to allow immigration of family members of Japanese-American's and to avoid legislation discriminating against Japanese.
The significance was that this occasion was immediately understood as Teddy Roosevelt's way of declaring that the United States, already an economic superpower, was also a military one. This led on our "superpower" for years to come.
First war in which an "enlightened" European power was defeated by a non-European nation. This war was a very unlucky one for Russia. Japan was saved through the intervention of the US.
The changes brought in by this revolution created a sense of freedom to the citizens of its country. This revolution was centered on expanding the Mexican economy.