According to [1], Android makes up 60% of the US smartphone market share; but you're comparing many different brands of phones, all of which use Android, to the iPhone which isn't exactly fair.

You can see that the iPhone is still has the largest smartphone market share in the US.

Also, bear in mind that Android phones thrive in less rich countries like Mexico [2] or the Philippines [3]. The price of the iPhone is perhaps the largest burden for these people, but I'm willing to speculate that if given the choice, most would favor iOS over Android.

[1]: https://www.counterpointresearch.com/us-market-smartphone-sh...

[2]: https://www.statista.com/statistics/867948/market-share-smar...

[3]: https://gs.statcounter.com/vendor-market-share/mobile/philip...