Final answer:
Catherine the Great changed Russia by modernizing and westernizing it, reforming Russia's economy, and expanding Russia's territory.
Step-by-step explanation:
Catherine the Great
changed Russia by
modernizing and westernizing
it,
reforming Russia's economy
, and
expanding Russia's territory
. She implemented numerous reforms to modernize the country, such as improving education, promoting arts and culture, and adopting Western customs and practices. Additionally, she implemented economic reforms that led to the growth of industries and trade. Catherine the Great also expanded Russia's territory through military campaigns and acquisitions.