波多馬克河係美國東部一條河,起源自西維珍尼亞州,最後流入大西洋,長652公里。
美國立國無耐,各州對美國永久首都位置有唔少爭論,北方各州想喺紐約,但南方各州希望喺南方,最後喺1790年協議好喺南北交界嘅波多馬克河起首都,即係之後嘅華盛頓特區。
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