The world is moving toward crisis and a state of "geopolitical depression" as the presidency of Donald Trump accelerates divisions among citizens and the unraveling of the global order, risk consultancy Eurasia Group warns. Liberal democracies are suffering from a deficit of legitimacy not seen since World War II, and today's leaders have largely abandoned civil society and common values, Eurasia Group says in its annual assessment of top geopolitical risks. The breakdown in norms opens the door to a major event that could rock the global economy and markets. "In the 20 years since we started Eurasia Group, the global environment has had its ups and downs. But if we had to pick one year for a big unexpected crisis — the geopolitical equivalent of the 2008 financial meltdown — it feels like 2018," said Eurasia Group President Ian Bremmer and Chairman Cliff Kupchan. U.S. global power is "sputtering to a stall" as the Trump philosophy of retrenchment and unilateralism sows confusion among both allies and rivals, Eurasia Group says. The world now lacks leadership to steer it through the impending crisis. "'America First' and the policies that flow from it have eroded the U.S.-led order and its guardrails, while no other country or set of countries stands ready or interested in rebuilding it … significantly increasing global risk." Here are Eurasia Group's top risks in 2018:

China will fill the vacuum left by the United States

In the absence of U.S. leadership, China faces less resistance in setting the international standards in trade and investment, technology development and the value of noninterference in other countries' affairs. This could force businesses to adapt to a new set of rules and may increase tensions with the Asia-Pacific region's more democratic powers.

Miscalculations spark conflict

The world has become more dangerous because there is no global power to underwrite security and many subnational and nonstate actors can carry out destablizing actions. Cyberattacks and terrorism are two top risks, but there is also the chance of a miscalculation leading to conflict as North Korea continues to test ballistic missiles in a region full of U.S. allies and as the United States and Russia back rival factions in Syria.

Technology cold war

The United States and China are racing to dominate areas like artificial intelligence and supercomputing, setting up a battle to supply other countries with civilian infrastructure, consumer goods and security equipment. This could lead to a fragmented tech space in which China and countries in its sphere of influence seek to control the flow of information and the United States guards against foreign investment in American tech companies.

Tough year for Mexico

Mexico and investors in its economy will suffer more than the United States if NAFTA negotiations do not succeed this year. A presidential campaign that begins in March will make it difficult for Mexican candidates to accept tough compromises with an antagonistic Trump administration.

Deteriorating U.S.-Iran relations

The Trump administration has announced a more aggressive strategy to clamp down on Iran's nuclear program and involvement in foreign affairs. This raises a number of risks, including that the 2015 Iran nuclear deal dissolves, tensions lead to a deadly conflict in the Persian Gulf or another regional theater and a more assertive Saudi Arabia takes the U.S. stance as a green light for actions that escalate tensions.

Falling trust in democratic institutions

The rise of an "increasingly toxic antiestablishment sentiment" is eroding trust in political institutions in democratic countries, as well as the media and the electoral system in the United States. Weakness in these institutions can lead to instability, authoritarianism, unpredictable policy and conflict.

Rise of protectionism 2.0

Countries are using nontraditional measures — bailouts, subsidies and "buy local" requirements — to protect intellectual property and technology, a trend that can be called "protectionism 2.0." This could lead to a surge in protectionism, a more complex and contradictory regulatory environment, and resentment among countries whose policies are seen to target one another.

Brexit gets tougher to manage

The United Kingdom is moving toward a phase of its separation from the European Union that will bring more difficult negotiations, including designing a border for Northern Ireland and finalizing the U.K.'s divorce bill. Prime Minister Theresa May needs to clarify the U.K.'s goals to reach a deal with Europe, but as she reveals her hand, her leadership may be challenged by rival political factions with contradicting priorities.

Identity politics in southern Asia

Islamism in Indonesia and Malaysia, Indian nationalism, and anti-Chinese and anti-minority sentiment across southern Asia are on the rise in countries that are growing more prosperous. These strains of identity politics can contribute to instability and protectionism and bleed over into economic policy in ways that damage the business environment.

Africa becomes less stable