Japan used to be an isolated country as it's borders were closed to everyone. After they opened the borders, they started developing the country by accepting new technologies and anything similar that was considered to be beneficial for the country's well being. They also started to perfect things that they adopted which led to new inventions and advancements.
Slavery was implicitly recognised in the original Constitution in provisions such as Article I, Section 2, Clause 3, commonly known as the Three-Fifths Compromise, which provided that three-fifths of each state's enslaved population (“other persons”) was to be added to its free population for the purposes of apportioning seats in the United States House of Representatives and direct taxes among the states.
Bunker Hill I'm pretty sure
In the light of your question I think it was a Russian success and the US is yet to achieve such achievements. During that time when the Cold War is in the climax between the two superpowers both competed not only in arms race but technological advances trying to outwit each other. The Russians gain the upper hand because they were able to make the things stated above before the United States but in the end the US was able to make also such things in their own ways and successfully outwitting the USSR in economy and world power.
