Ricotta Vs Bechamel Sauce: Which One Is More Traditional For Lasagna? - Tasting Table
Briefly

"If you're further south, you will see ricotta incorporated into the lasagna more, while if you're further north you will see a béchamel sauce used. These recipes were developed years and years ago based upon the ingredients that were readily available in that region."
"Lasagna originated in Greece, but we have the conquering ancient Romans to thank for the dish's rise to global popularity, as well as the Italians who immigrated to North America in the late 19th century."
Read at Tasting Table
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