| > The U.S. at that time was nobody. The US was an APEX power and had been for a long time. Nobody could conquer it. To claim the US was a nobody is a laughable. > It was still undergoing the post-Civil War recovery After the civil war, the US fielded the greatest army in the world and it's economy was growing because it was shifting to westward expansion. We took over territory bigger than western europe. Not only that, the US was the largest producer of oil BY FAR at that time. > the Industrial Revolution JUST arrived on the continent. It just arrived in european mainland as well relatively speaking... > No European nation was interested in conquering the largely agrarian society. No european nation could. Let's stop pretending any european country had any hope. A european country conquering the US in the 1800s is like costa rica conquering the US today. It's laughable. During the civil war, the US developed much of the military technology that was used in the first world war a few decades later. |
In addition, to your points, after the civil war, the U.S. had the largest number of guns in civilian hands of any country by far. The populace was so well armed that an invasion would have been ridiculous.
The U.S. also had the largest economy in the world at the time, a population about the same size as Germany, and had the Atlantic Ocean situated between itself and an invading army.
By the 1870s the U.S. had a large iron and steel industry and in less than 20 years later (by 1889) the U.S. was producing more steel than Great Britain.
Furthermore, the U.S. had the second largest navy in the world at the end of the Civil War--a navy that was very modern since it was largely composed of new ships built during the war. The U.S. Navy was also the most experienced by far with modern naval combat since they were the first country to use ironclads in battle. Granted the Navy rapidly declined in size after this time period, but given that the buildup happened in only 4 years in the first place, new ships could have been rapidly brought online if a war broke out.
The U.S. was also covered in railroads and telegraph lines by this time that they could use to coordinate movements and rapidly deploy troops--this was a huge advantage not available to an invading army.
The idea of a European power invading the U.S. after the civil war is definitely laughable.