Since then, the destruction has only been magnified. An estimated 6,000,000 homes have been destroyed, and nearly 1,400,000 farm families have been left without tools or animals to work their lands. Transportation and communications systems are totally disrupted. Roads are damaged, bridges out and inland waterways blocked.The rape of the country continued right up until the Pakistani army surrendered a month ago. In the last days of the war, West Pakistani-owned businesses—which included nearly every commercial enterprise in the country—remitted virtually all their funds to the West. Pakistan International Airlines left exactly 117 rupees ($16) in its account at the port city of Chittagong. The army also destroyed bank notes and coins, so that many areas now suffer from a severe shortage of ready cash. Private cars were picked up off the streets or confiscated from auto dealers and shipped to the West before the ports were closed."
The politicians elected in 1970 formed the provisional parliament of the new state. The Mukti Bahini and other militias amalgamated to form a new Bangladeshi army to which Indian forces transferred control on 17 March. Mujib described the fallout of the war as the "biggest human disaster in the world," claiming the deaths of as many as 3 million people and the rape of more than 200,000 women.
The government faced serious challenges, which including the rehabilitation of millions of people displaced in 1971, organising the supply of food, health aids and other necessities. The effects of the 1970 cyclone had not worn off, and the state's economy had immensely deteriorated by the conflict. There was also violence against non-Bengalis and groups who were believed to have assisted the Pakistani forces. By the end of the year, thousands of Bengalis arrived from Pakistan, and thousands of non-Bengalis migrated to Pakistan; and yet many thousands remained in refugee camps.
After Bangladesh achieved recognition from major countries, Mujib helped Bangladesh enter into the United Nations and the Non-Aligned Movement. He travelled to the United States, the United Kingdom and other European nations to obtain humanitarian and developmental assistance for the nation. He signed a treaty of friendship with India, which pledged extensive economic and humanitarian assistance and began training Bangladesh's security forces and government personnel. Mujib forged a close friendship with Indira Gandhi, strongly praising India's decision to intercede, and professed admiration and friendship for India.
He charged the provisional parliament to write a new constitution, and proclaimed the four fundamental principles of "nationalism, secularism, democracy and socialism," which would come to be known as "Mujibism." Mujib nationalised hundreds of industries and companies as well as abandoned land and capital and initiated land reform aimed at helping millions of poor farmers. Major efforts were launched to rehabilitate an estimated 10 million refugees. The economy began recovering and a famine was prevented. A constitution was proclaimed in 1973 and elections were held, which resulted in Mujib and his party gaining power with an absolute majority. He further outlined state programmes to expand primary education, sanitation, food, healthcare, water and electric supply across the country. A five-year plan released in 1973 focused state investments into agriculture, rural infrastructure and cottage industries.