What did John Hay try to accomplish by proposing the Open Door Policy? keeping other nations from getting involved in trade
allowing China to write its own trade agreement
making China an important trade partner
changing the Chinese government

making China an important trade partner

Explanation:

In late 19th century, many western countries fight for the exclusive rights to trade with China.

Since the reward was very lucrative, the western countries were willing to go into an all out war with one another for the exclusive rights.

To prevent this, John Hay proposed an open door policy. This policy allowed colonial powers to trade with China on equal terms so all of them can get some benefits from trading relationship with China. This policy effectively made china became an important trade partner for many Western countries.

2686-2181 bce-- "egyptian civilization developed along the nile river in large part because the river’s annual flooding ensured reliable, rich soil for growing crops."

1069-664 bce-- "ancient egyptians developed wide-reaching trade networks along the nile, in the red sea, and in the near east."