chief of state and chief executive im pretty sure
They made Channels underground a lined with clay to prevent sepage in the surrounding soil. They were a big contribution and we still do something inspired by that today.
B
monroe doctrine stopped European colonization in the western hemisphere
The amendment process best shows the concept of federalism because D. it requires involvement by both the national and State levels of government.
The right order is Cartography -> Navigational Compass -> Photography -> Internet.
Cartography - The first examples of maps used in Cartography dates back to the human pre-history. The oldest recorded route was found in Anatolia and was dated 6100-6300 BC, showing buildings and a volcano.
Navigational Compass - The first known compass was made with Lodestone, a black magnetized iron ore, during the 12th century. Chinese, European and Arab mariners used a different mechanism to make the magnetic phenomenon possible, but eventually, the lodestone was used to magnetize a needle that was floated on a small piece of wood in a small container of water.
Photography - The modern photography was established during the 19th century and was only used in a consistent manner by geographers by the end of that century.
Internet - The most recent milestone was the internet that came after the development of electronic computers in the 1950s.
