America's Presidential electoral college system: a severe Achilles heel.
From the perspective of laws/ morals.
Communism is a legal / moral philosophy that promises fairness and care for poor: "from each his ability, to each his needs", but usually sold by dishonest tyrants who break their own promises and betray the poor the moment they are enthroned.
Democracy is a legal / moral philosophy premised upon responsible selection of government by responsible citizens but due to man's flaws, many people vote leaders, e.g. Donald Trump for selfish reasons resulting in greater polarisation of society and less social harmony as a result.
Both systems are not perfect and have very specific self correcting abilities. Communist governments can be challenged/ replaced such as the Tian An Men protests in China in 1989 and the fall of the Berlin Wall reveal respectively.
Lousy USA presidents can be voted out by citizens or impeached by democratic vote in congress to have a new president installed.
For USA to exceed China as a super power, USA has to seriously reform the electoral college system of voting the president because this system is in excess of 150 years obsolete (having seen its peak functionality as the pony express https://en.m.wikipedia.org/wiki/Pony_Express of 1860 was able to carry state presidential choice information across from the furthest away state in 10 days); as it is unable to determine the most popular person for president (Hillary Clinton was the most popular choice for president in the 2016 USA presidential elections. (Senate may still be populated and operate under the electoral college system to VETO (block) presidential decrees to allow smaller populated states not to be bullied by higher populated ones.)
The strength of the democratic system is via free and fair elections using the latest vote counting technologies available but the USA method of electoral college voting is ridiculously obsolete as it remains premised on the pre telegraphic era of communication where by only single digit binary data could be transmitted (one yes or no vote for entire USA state). So until and unless the USA presidential electoral system can be reformed to be transparent and fair based in the latest telecommunication technology, USA will probably lag behind China in social, political, military etc development in so far that China is able to abide by its original communist manifesto, "from each his ability, to each his needs" and is seen by its citizens as earnestly doing so. The strength of the American system is vz free and fair elections and in so far that the vote calculation system for Presidential elections is obsolete, this will remain America's serious Achilles heel as the super powers of USA and China compete.