Lacagta Louisiana (Faransiiska: Vente de la Louisiane "Sale of Louisiana") waxay ahayd iibsashada dhulka Louisiana (828,000 oo mayl laba jibaaran ama 2.14 milyan oo km²) ee Mareykanka 1803 ee Maraykanka. lacag dhan konton milyan oo Faransiis ah ($ 11,250,000) iyo in la joojiyo deyn dhan 18 milyan oo faransiis ah ($ 3,750,000) oo wadarta guud ahaan lixdan iyo siddeed milyan oo faran ($ 15 milyan, oo u dhiganta $ 300 milyan sannadka 2016). Deegaanka Louisiana waxaa ku jira dhul ka yimid shan iyo toban dal oo Mareykanka ah iyo labo gobol oo Kanadiyaan ah. Dhulku wuxuu ka kooban yahay dhul ka yimid Arkansas, Missouri, Iowa, Oklahoma, Kansas, iyo Nebraska; galbeedka Wabiga Mississippi; qayb weyn oo ka mid ah waqooyiga Dakota; qayb weyn oo ka mid ah Koonfurta Dakota; qaybta waqooyi bari ee New Mexico; qaybta waqooyi ee Texas; degaanka Montana, Wyoming, iyo bariiska Colorado ee Bariga Koonfureed; Louisiana galbeedka Wabiga Mississippi (iyo New Orleans); iyo qaybo yaryar oo dhul ah oo ku yaal gobollada Canada ee Alberta iyo Saskatchewan.