How did people of southern india organize flourishing states and societies in the absence of major rivers?

There was a well developed and a highly efficient system of water management from the village level upwards in 900-1270 AD.The water tanks which came up during Chola Dynasty were too many but one stand out.Rajendra Chola built a huge tank named Solagangam in his capital city Gangaikonda Solapuram and was described as the liquid pillar of victory.About 16 miles long, it was provided with sluices and canals for irrigating the lands in the neighbouring areas.Another very large lake of this period, which even today seems an important source of irrigation was the Viranameri near Kattumannarkoil in South Arcot district founded by Parantaka Chola. Other famous lakes of this period are Madurantakam, Sundra-cholapereri, Kundavai-Pereri (after a Chola queen).

there are approximately 11 million illegal immigrants living in the united states.

the argument to restrict immigration is based on the perspective of protecting the safety and employment of the american people. president trump proposes to create a wall on the border with mexico, where there is the largest influx of illegal immigrants into the country.

the liberal perspective, however, is based on the argument that the us was founded by immigrants who came to build a better life with their families. in this sense, there is a special concern with the definitive legalization of "dreamers", young people who have arrived in the country as children. another important point is the concern not to cause traumas with the separation of relatives. making immigration more open would also be a good point to stimulate diversity in the us.

the legislative branch is formed by the house of representatives and the senate .