By their culture practices and traditions which passed on to their offspring
Silk Road in Western Han Dynasty (206 BC–24 AD) From 139 BC to 129 BC, Zhang Qian set out on his journey to the Western Regions twice, pioneering the world-famous route.
The Golden Age of China is thought to have been the time of Tang dynasty, between the years 618 and 907. It was a time of reforms and development in art, literature, architecture and others areas.
The Strategic Arms Reduction Treaty (START) number one was designed to
reduce the number of nuclear weapons. It was signed July 31, 1991 and went into full force by 1994. Eventually it was to control and remove warheads and nuclear weapons. Start 1 achieved an 80% removal which was considered to be a success. Other treaties followed.
Antarctica. There's conflicting info on this one but as far as your test/research goes, it's most certainly not any of the others.
