In the early 1990s book The Downing Street Years, UK Prime Minister Margaret Thatcher stated that the implementation of any long-term political or economical strategy requires time for concrete effects. "America First" is simply a strategy of president Donald Trump placing an emphasis on American priority, which in turn translates into maintaining America's powerful function in the world. In this context, a visit to Southeast Asia and east Asia and talks at the highest level, including China's leader Xi Jin-ping, was completed in late October 2025. The agreement signed or agreed in another form always requires careful supervision of its implementation. What lessons can we learn from president Trump's current journey?