How did the construction of waterways and roads help keep China united?

hello

Explanation:

It allowed trade routes to develop,

And more workers starting jobs.

Note:

Hope this helped

Yw!

Quote:

“Our greatest glory is not in never falling, but in rising every time we fall.”

– Confucius

offline recommendation systems option b

because recommendation systems produce a list of two ways

1. through collaborative filtering

or

2. through content-based filtering