Zheng He
The Chinese have their junk.
monsoon winds
Monsoon Winds
The vast majority of Chinese immigrants came by American vessels; not Chinese ships. Vessels traversing the Pacific Ocean using the same routes they've always taken, are the same routes used by the immigrants and railroad builders.
Shang
The open door policy
By trading vessels sailing out of Muslim lands across to the hind.
Basically, they were less likely to be attacked as a hostile ship carrying weapons.
Their merchant ships being attacked by pirates
They had the entreprenarial urge, they had products to sell, and wanted products they did not have or make. So they developed a fleet of cargo vessels to move the produce, and a fleet of warships to protect their trading fleet and their trading stations around the Mediterranean.
Unknown; but concrete (or stone) anchors have been found in California rivers, which match anchors found on ancient Chinese vessels (museum samples).
wagawaga suaga diadu