Question: When  did the revolutionary wave which  Syria enjoyed an improvement in relations with several of the states in its region in the 21st century, prior to began 

Context paragraphs:
Amorites: The Amorites ( ; Sumerian 𒈥𒌅 "MAR.TU"; <a href="Akkadian">Akkadian</a> "Tidnum" or "Amurrūm"; <a href="Egyptian%20language">Egyptian</a> "Amar"; <a href="Hebrew%20language">Hebrew</a> אמורי "ʼĔmōrī"; <a href="Ancient%26nbsp%3BGreek">Ancient Greek</a>: Ἀμορραῖοι ) were an ancient <a href="Semitic%20languages">Semitic-speaking</a> people from <a href="Syria%20%28region%29">Syria</a> who also occupied large parts of southern <a href="Mesopotamia">Mesopotamia</a> from the 21st century BC to the end of the 17th century BC, where they established several prominent <a href="city%20state">city state</a>s in existing locations, notably <a href="Babylon">Babylon</a>, which was raised from a small town to an independent state and a major city.  The term "Amurru" in Akkadian and Sumerian texts refers to both them and to their principal deity.

Arab Spring: The Arab Spring, (Arabic: الربيع العربي‎ ‎ "ar-Rabīʻ al-ʻArabī") also referred to as Arab revolutions (Arabic: الثورات العربية‎ ‎ "aṯ-'awrāt al-ʻarabiyyah"), was a revolutionary wave of both violent and non-violent demonstrations, protests, riots, coups and civil wars in North Africa and the Middle East that began on 17 December 2010 in Tunisia with the Tunisian Revolution.

Socialism of the 21st century: Socialism of the 21st century (Spanish: "Socialismo del siglo XXI" ) is a political term used to describe the interpretation of socialist principles advocated first by Heinz Dieterich in 1996 and later by Latin American leaders like Hugo Chávez of Venezuela, Rafael Correa of Ecuador, Evo Morales of Bolivia, and Luiz Inácio Lula da Silva of Brazil.  Socialism of the 21st century argues that both free-market industrial capitalism and twentieth-century socialism have failed to solve urgent problems of humanity, like poverty, hunger, exploitation, economic oppression, sexism, racism, the destruction of natural resources, and the absence of a truly participative democracy.  Therefore, because of the local unique historical conditions, socialism of the 21st century is often contrasted with previous applications of socialism in other countries and aims for a more decentralized and participatory planning process.  Socialism of the 21st century has democratic socialist elements, but primarily resembles Marxist revisionism.

Foreign relations of Syria: Ensuring national security, increasing influence among its Arab neighbors, and securing the return of the Golan Heights, have been the primary goals of Syria's foreign policy.  At many points in its history, Syria has seen virulent tension with its geographically cultural neighbors, such as Turkey, Israel, Iraq, and Lebanon.  Syria enjoyed an improvement in relations with several of the states in its region in the 21st century, prior to the Arab Spring and the Syrian Civil War.

The Condensed 21st Century Guide to King Crimson: The Condensed 21st Century Guide to King Crimson is a compilation by progressive rock band King Crimson, released in 2006.  It contains select studio tracks from the two box sets, "The 21st Century Guide to King Crimson – Volume One – 1969–1974" and "The 21st Century Guide to King Crimson – Volume Two – 1981–2003".

Qatar–Saudi Arabia proxy conflict: The Qatar–Saudi Arabia proxy conflict (also known as the Second Arab Cold War) is the ongoing struggle for regional influence between the Gulf Cooperation Council monarchies of Qatar and Saudi Arabia.  Qatar–Saudi Arabia relations have been especially strained since the beginning of the Arab Spring, which left a power vacuum both states sought to fill, with Qatar being supportive of the revolutionary wave and Saudi Arabia opposing it; since both states are allies of the United States, they avoid direct conflict with one another.  Qatar has had differences with other Arab governments on a number of issues: it broadcasts Al Jazeera; it is accused of maintaining good relations with Iran; and it has supported the Muslim Brotherhood in the past.

Four Cs of 21st century learning: The Four Cs of 21st century learning, also known as the Four Cs or 4 Cs, are four skills that have been identified by the United States-based Partnership for 21st Century Skills (P21) as the most important skills required for 21st century education: critical thinking, communication, collaboration, and creativity.

21st Century (Groove Coverage album): 21st Century (known as 21st Century Digital Girl on some online stores) is the third album of the German Eurodance band Groove Coverage, released on July 7, 2006.  It was previously available a few days earlier than expected on the German version of iTunes.  Compared to Groove Coverage's previous albums, "7 Years and 50 Days" and "Covergirl", this album contains much more pop music such as "21st Century Digital Girl", "What You C is What You Get", and a rock song, titled "Rock".

21st Century Digital Girl: "21st Century Digital Girl" is the third and final single from the album "21st Century" by German trance group Groove Coverage.  The song is an adaptation of Bad Religion's "21st Century Digital Boy".

21st century in fiction: Many science fiction works have been set in the 21st century (years 2001 to 2100).  With humanity now in the 21st century, many of the predictions of these works have so far been proven obsolete.  This page lists only "predictions" regarding the 21st century, as opposed to contemporary accounts of the actual 21st century, which would be too numerous to list.

Supporting paragraphs: Foreign relations of Syria Arab Spring
Answer: 17 December 2010