Friends, how to overcome nervousness when doing a presentation in classroom. it's for my history presentation plus my first ever presentation.

first, the romans stayed isolated because they had to defend their own territories from neighboring cities that were harassing them, like the etruscans. second, once the romans managed to defeat their neighbors, and started to expand their territory, they started to build roads and bridges. finally, now that the romans have covered their territory with roads functioning as highways, they could mobilize their legions faster to assemble larger military units in a specific place

the money supply is the total amount of money available in the economy. how do changes in the money supply affect people and businesses?