According to John Wesley Powell, the minimum rainfall to grow crops in arid regions was 20 inches of rain annually only to have a successful farming on the plains; However, with that quantity agriculture would not be uniformly successful from season to season.
the answer to your question is
transform it from an expensive luxury to a mid-priced good
people light up fireworks on the 4th of july because it's a reminder of our independence and that we are a free and united country. it's the birth date the united states of america as an independent nation.