Answer:
Industrialization and advancement in transportation
Step-by-step explanation:
In the early 1800s manufacturing in the U.S. Converted from homemade industry to factory production because of "Industrialization and advancement in transportation"
This is evident in the fact that it was during this period the invention of machines that are capable of doing the manufacturing work came to be.
For example in the textile industry, where machines turn harvested cotton into textile materials.
Also, it was during this period, the railway industry came to be as against horse and cart in America.