More Northern gunboats came up the river.

更多的北方炮舰逆流。

The more powerful country opened the door of the weaker one by gunboat diplomacy.

强国用炮舰外交打开了弱国的大门。

The United States had been interested in the Pacific for half a century already, in 1853 the US had sent a fleet to Japan to bully the Japanese into a treaty relationship through gunboat diplomacy do business or we shoot.

美国对太平洋地区感兴趣已有十年了，1853年美国派遣一支舰队去日本，利用炮舰外交恐吓日本与自己缔结条约关系。