What will define the 20's in the US?

As we're on the cusp of another decade, what event, technological innovation, etc etc do you think will define the 2020's when we look back on them in American history?

I'm gonna give a few I randomly thought of:

- Marijuana legalized federally (no big surprise here), mushrooms widely becoming legal in certain states
- Electric cars becoming the 'standard' vehicle to buy
- We establish a research station on the moon, tourism in the works (think everything you hate here..billboards for days..on the moon..yay!)

What do you think?