What was arguably the main difficulty in maintaining the large land empire of russia?
a. ethnic divisions
b. inexperienced leaders
c. lack of industrialization
d. lack of natural resources

The correct answer is letter A.

Ethnic divisions were one of the many difficulties that Russia had in the process of maintaining a large land empire. During the 19th century, Russia had the third largest population in the world. Disparities in economics, rebellions, and religion were also the difficulties that caused Russia to have difficulties in maintaining their large land empire.