Actually, since you brought up history, you will know what make the United States unique among other States. Nations/countries are known as States. The United States took 50 countries and combined them underneath one flag, which Europe has tried with limited success. The US has gotten so good at combining, we forget that we are actually 50 States/countries. If you need a reminder of this, just look at States National Guard. The reason for States having their own National Guard was to secure their individual sovereignty. No longer do we view ourselves as individual nations especially since the Civil War and that Federalism was affirmed as the leading guidance.
So, you say that the US and my isolationist approach is for one Nation, but the realty is that it covers 50 nations that have come under one flag.
Every country has some form of isolation and this is generally demonstrated with tariffs to protect the local industries. Currently China is showing this by not exporting urea, India is doing the same by not exporting wheat. So, rather you like it or not, every country practices isolationism and rightfully so. The representatives of the nation should place their country first and then when needs are meet there, use the excess to influence and help other nations. You shouldn't place your nation in a position of need in the name of being a good neighbor.
As far as oil, when you are the top producer of oil and you produce more oil than you use, you absolutely should be able to influence the prices.
Top 10 Countries with the Highest Oil Production (barrels per day)
United States - 11,567,000.
Russia - 10,503,000.
Saudi Arabia - 10,225,000.
Canada - 4,656,000.
Iraq - 4,260,000.
China - 3,969,000.
United Arab Emirates - 2,954,000.
Brazil - 2,852,000.
So our influence on the global market should be great and our ability to reduce our oil prices by being self-serving should have us at one of the lost fuel cost.
Finally, I do agree, the worldwide influence of just printing out money and handing it out does have a huge impact on inflation. The print and spend policy of our nation and others need to stop if they want to control inflation and stop trying to buy votes. IF we would stop this in our nation and solidify the dollar, you would see the world economy starting to stabilize. When you are the biggest, you carry a lot of influence.
The United States' economy is the largest in the world as measured by nominal GDP. The biggest contributor to that GDP is the economy's service sector, which includes finance, real estate, insurance, professional and business services, and healthcare.