Economy
I think the future Super Power of the world will be China. By 2028, China will have the largest economy. Its economy is growing at rapid paces and is already larger than the USA's economy by 4% which China is 16.8 trillion. China is the largest trading nation since 2013. China exports items and receives around $207 trillion and imports items for about 10.1 billion. China has been the worlds largest exporter since 2009.
Military
Chin as military is also a very good one because they have more air crafts, tanks, and they have the best man power. China has 280million more man power than the USA. China has about 20 times the amount of aircraft tanks and man power than the USA. China was also placed first for the world for army main battle tanks.
Political
Countries look up to China for building advanced technology, also China supplies mast countries with supplies. China supplies more countries than the United States. Also about one fifth of the world is of Chinese nationality.
USA dropping bombs on Hiroshima and Nagasaki was right because,If it was just a bloody round the clock bombing then it would have led to a far higher death toll and so the atomic weapons actually saved thousands of American and millions of Japanese lives. Also, just over 200,000 people were killed in total by the atomic bombs, it is estimated that 300,000–500,000 Japanese people died or disappeared in Soviet captivity. Had the war continued, that number would have been much higher.
I agree North Korea has tried to blow up Guam but it never worked, but North Korea has been working on there equipment and could probably blow up guam now if the want to and any other country. And since they have been working on it they could go to war at any time.