Which of the following has increased tensions between the US and China in the twenty-first century?

Hello. You did not provide answer options. However, we can say that what causes increased tensions between the USA and China are the financial, political, technological and military aspects.

Explanation:

As China developed and became a great power, relations between other countries became stronger and stronger, especially with other powers such as the USA, for example. However, with the election of Donald Trumo, the American government began to adopt a stance against Pequin creating tension between the two countries, which intensified with the dispute between financial, political, technological and military aspects.

byzantine empire is the answer i think you are looking for.

hope this : )