The seaports in Long Beach and Oakland, Calif. saw increased cargo volumes last month, benefiting from retailers gearing up for the back-to-school and holiday seasons, according to recently released data. The Port of Long Beach saw its busiest July and third-busiest month ever with 882,376 TEUs last month, a 52.6% year-over-year jump from 2023, according to data released Aug. 14. It beat its July 2022 cargo record by 12.4%, the port said. Imports in July spiked 60.5% to 435,081 TEUs, while exports went up 16.3% to 104,834 TEUs, the data show. Long Beach moved 20% more cargo in the first…