According to vegetius, what led to the changes in roman military armor and training techniques?

these the citzens and goverment come to terms some of the amendments gave the states more power then the goverment and some protocted americans rights

congress also has implied powers, which derive from the necessary and proper clause of the constitution and permit congress "to make all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this constitution in the government of the united states.