From The Washington Post authored by Mollie Bloudoff-Indelicato:
“We tend to think of proposals as romantic and special occasions, but the history behind them is much more legalistic and formal, says Katherine Parkin, a professor of history at Monmouth University in New Jersey. Men get down on one knee to demonstrate the chivalry of their intentions and provide a diamond ring as proof that they can care for their partner financially. Because men have historically made more money than women, it tracked that they would be the ones to propose.”
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