What was the effect of Japans isolation?

Answer 1

Although Japan managed to avoid direct warfare with its Asian neighbors, and escaped two invasions by the Mongols, Japan was not always a peaceful country. Beginning around 1185, rival shogunates fought for control over the islands almost constantly. The isolation from the West was broken accidentally by the Portugese, who introduced firearms to Japan in 1543. This led to attempted invasions of Korea and China near the end of the 16th Century.

Only during the Edo period (1603-1868) did Japan maintain a relatively peaceful internal state. In 1637, an uprising by Christians was crushed and foreigners were banned from the country (Sakoku, or locked country). Some 200 years later, in 1853, the fleet of Commodore Perry entered Yokohama harbor, the "Black Ships" heralding the industrial technology of the Western powers. While the isolation had prevented Japan's involvement with foreign wars, it was now beset by militarily superior colonial powers. It would have to struggle to catch up to avoid being dominated by them.

Answer 2

peace, stability, and posperity