拱心石

jiù rú gǒng xīn shí zhī chēng qǐ shí gǒng yī yàng rén men rèn wéi bīn xī fǎ ní yà zhī chēng qǐ le nián qīng de měi lì jiān gòng hé guó

就如拱心石支撑起石拱一样，人们认为宾夕法尼亚支撑起了年轻的美利坚共和国。

Just as a keystone holds together a stone arch, Pennsylvania was seen as holding together the young American republic.