The Egyptians and the Romans.
The president who did that was richard nixon ur welcome.
Answer:
Sensors that measure a variety of essential soil properties on the go are being developed. These sensors can be used either to control variable rate application equipment in real-time or in conjunction with a Global Positioning System (GPS) to generate field maps of particular soil properties. Depending on the spacing between passes, travel speed, and sampling and/or measurement frequency, the number of measurement points per acre varies; however, in most cases, it is much greater than the density of manual grid sampling. The cost of mapping usually is reduced as well.
Explanation:
The committees of correspondence were shadow governments organized by the Patriot leaders of the Thirteen Colonies on the eve of the American Revolution. They coordinated responses to England and shared their plans; by 1773 they had emerged as shadow governments, superseding the colonial legislature and royal officials. The Maryland Committee of Correspondence was instrumental in setting up the First Continental Congress, which met in Philadelphia. These served an important role in the Revolution, by disseminating the colonial interpretation of British actions between the colonies and to foreign governments. The committees of correspondence rallied opposition on common causes and established plans for collective action, and so the group of committees was the beginning of what later became a formal political union among the colonies.
