Online sales nationwide spike during Amazon Prime Day event

Amazon.com Inc. (Nasdaq: AMZN) said it had its biggest Prime Day ever as online sales in the U.S. jumped during the two-day event. While the Seattle-based e-commerce giant often touts the success of its Prime Days, it rarely discloses the total revenue for a given Prime Day event. This year, Amazon said it sold more than 300 million items over July 12 and 13. By that measure, it eclipsed 2021 when 250 million items were sold. It's a far cry from the original Prime Day in 2015, when Amazon sold…