https://techcrunch.com/2018/10/17/how-to-download-your-apple-data/

Good news! Apple now allows U.S. customers to download a copy of their data, months after rolling out the feature to EU customers.

But don’t be disappointed when you get your download and find there’s almost nothing in there. Earlier this year when I requested my own data (before the portal feature rolled out), Apple sent me a dozen spreadsheets with my purchase and order history, a few iCloud logs, and some of my account information. The data will date back to when you opened your account, but may not include recent data if Apple has no reason to retain it.