What is one effect of the extension of the Maurya Empire around 260 B. C.?

Spread of the Edicts of Asoka across the empire.

Explanation:

The quest to expand the Mauryan Empire into the Deccan plateau began in 300 B.C.E when Bindusara, son of Chandragupta started conquering several kingdoms in order to achieve his aim. He succeeded in the other kingdoms except for four kingdoms of which the Kalinga kingdom was inclusive. He was succeeded by his son Asoka in 273 B.C.E. Asoka took it upon himself to conquer the Kainga Kingdom.

honestly it just comes down to the

cultural/diplomatic relations. most medieval japanese   culture has chinese origins. writing, architecture etc.