Passage: Tunisia achieved independence from France on March 20, 1956 with Habib Bourguiba as Prime Minister.  March 20 is celebrated annually as Tunisian Independence Day.  A year later, Tunisia was declared a republic, with Bourguiba as the first President.  From independence in 1956 until the 2011 revolution, the government and the Constitutional Democratic Rally (RCD), formerly Neo Destour and the Socialist Destourian Party, were effectively one.  Following a report by Amnesty International, The Guardian called Tunisia "one of the most modern but repressive countries in the Arab world".In November 1987, doctors declared Bourguiba unfit to rule and, in a bloodless coup d'état, Prime Minister Zine El Abidine Ben Ali assumed the presidency in accordance with Article 57 of the Tunisian constitution. The anniversary of Ben Ali's succession, 7 November, was celebrated as a national holiday. He was consistently re-elected with enormous majorities every five years (well over 80 percent of the vote), the last being 25 October 2009, until he fled the country amid popular unrest in January 2011.

Question: when did Tunisia achieve its independence?
March 20, 1956