The last month of 2017 saw outrage and chaos, all stemming from a controversial decision made on Jerusalem. While the rest of the world celebrated the approach of a new year, tensions once again rose between Israel and Palestine.

This December, the spotlight was on this 3,000 year old holy city, Jerusalem.

It's seen as holy by three religions. But peace in the Middle East has once again, fallen to turbulence and violence due to US President Donald Trump's announcement on December 7th.

DONALD TRUMP US PRESIDENT "It is time to officially recognize Jerusalem as the capital city of Israel."

It was not unexpected. The US Congress passed the Jerusalem Embassy Act in 1995, legally recognizing the city as the Israeli capital, authorizing the embassy's relocation. But the embassy move never happened, because then-President Bill Clinton and his successors routinely signed presidential waivers to postpone the action, avoiding exacerbating the Palestine-Israel conflict.

DONALD TRUMP US PRESIDENT "While previous presidents have made this major campaign promise, they failed to deliver. Today I am delivering."

The announcement immediately met with cheers from Israel.

BENJAMIN NETANYAHU ISRAELI PRIME MINISTER "It's been the capital of Israel for 3,000 years..."

But the Palestinians were furious.

MAHMOUD ABBAS PALESTINIAN PRESIDENT "These deplorable and unacceptable measures deliberately undermine all peace efforts."

Within days, the announcement sparked protests all over the Arab world and from other Muslim countries. The Arab League swiftly called an emergency meeting, deciding on a unified stance to protest against the unilateral US plan. While the Organization of Islamic Cooperation reacted with a unanimous recognition of East Jerusalem as the Palestinian capital.

RECEP TAYYIP ERDOGAN TURKISH PRESIDENT "Jerusalem is our red line."

AYATOLLAH ALI KHAMENEI SUPREME LEADER OF IRAN "The enemy will absolutely be unable to achieve its desired goals on the issue of Palestine."

HASSAN ROUHANI IRANIAN PRESIDENT "The US and Israel cannot oppose people's emotions and beliefs."

FAYSSAL MIKDAD SYRIAN DEPUTY FOREIGN AND EXPATRIATES MINISTER "Jerusalem is the capital of the Palestinian people of the Palestinian state.

The issue reached a new stage on December 18th when 14 out of 15 members of the UN Security Council voted in favor of an Egypt-drafted resolution to rescind the US decision. The US was the nation that vetoed the vote. And a few days later, on the 21st, the US faced more opposition at the UN, with members of the General Assembly overwhelmingly rejecting the US' move.

ANTONIO GUTERRES UN SECRETARY-GENERAL "I want to make it clear there is no alternative to the two-state solution. There is no Plan B."

MATTHEW RYCROFT UK AMBASSADOR TO THE UN "The EU will not recognize any changes to the pre-1967 borders."

Despite this, US ambassador to the UN Nikki Haley argued that her country has a sovereign right to determine where and whether to establish an embassy in a country, hinting that the Jerusalem move is imperative. One day after the General Assembly vote, the Israeli Prime Minister told CNN that several countries are seriously considering following in the footsteps of the US by moving their embassies to Jerusalem.

The US announcement on Jerusalem has led to dozens of deaths in border clashes. And as US Secretary of State Rex Tillerson has said it will take around two years for the relocation to happen, this could spell more chaos and clashes in the region.