Exercise

Setting themes

Reusing a theme across many plots helps to provide a consistent style. You have several options for this.

Assign the theme to a variable, and add it to each plot.
Set your theme as the default using theme_set().

A good strategy that you'll use here is to begin with a built-in theme then modify it.

plt_prop_unemployed_over_time is available. The theme you made earlier is shown in the sample code.

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Assign the theme to theme_recession.
Add the Tufte theme and theme_recession together.
Use the Tufte recession theme by adding it to the plot.