What caused the change from the roman republic to the roman empire?

a. civil war, a failing economy, and slavery

b. the death of augustus

c. the division of the empire

d. the end of the pax romana

in the declaration of independence, thomas jefferson announced that every human being has “certain unalienable rights,” among which are those to “life, liberty, and the pursuit of " hope i

the name of the theory is landmass theory.

not sure might be he acquired the entire oregon territory from great britain