How did the actions of emperor trajan contribute to the growth and expansion of the roman empire?

The actions of emperor trajan contribute to the growth and expansion of the roman empire due to fact that he begune expansion of the empire north form danube river by conquering dacia modern day romania

The transcontinental railroad provided a means of fast transportation. it cut a 6 month trip into 6 days, created jobs for many people and encouraged immigration. the homestead act played a huge role in western expansion; it allowed settlers to begin a fresh start, and gave them land in exchange for their residence for up to five years and a small fee.