What methods did the Incas use to unify their large empire?

Make it simple and short.

5 answers

The Incas used a centralized government, extensive road networks, a common language (Quechua), and a system of tribute and labor to unify their large empire.
can you change the word centralized?
The Incas used a strong government, extensive road networks, a common language (Quechua), and a system of tribute and labor to unify their large empire.
can you also change the word tribute?
The Incas used a strong government, extensive road networks, a common language (Quechua), and a system of taxation and labor to unify their large empire.