20172021

20172021 denotes the years 2017 through 2021, a period characterized by rapid political changes, evolving international relations, a global health crisis, and rapid technological development. In national politics, the United States underwent a transition from the Trump administration (2017–2021) to the Biden administration in January 2021, influencing foreign policy, trade, and domestic governance. Abroad, long-running negotiations around Brexit progressed toward completion of a withdrawal framework and trade arrangements, while U.S.–China relations remained a focal point of global strategic competition and tariff disputes.

Climate policy and multilateralism were prominent, with the United States exiting the Paris Agreement in 2017 and rejoining in 2021, and international climate diplomacy continuing through events such as COP26 in 2021.

Public health and the economy dominated the latter part of the period due to the COVID-19 pandemic. The outbreak identified in 2019 led to global travel restrictions, healthcare strain, and a deep economic downturn in 2020, followed by recovery in 2021 driven by vaccination campaigns and stimulus measures.

Technology and society experienced accelerating digital transformation, growth of online platforms, and heightened attention to cybersecurity, misinformation, and remote work. The era also saw ongoing debates over data privacy, automation, and the societal impacts of rapid technological change.

Overall, 20172021 is viewed as a transitional era marked by significant shifts in leadership, international alliances, public health responses, and the speed of technological change that shaped policy and everyday life across many regions.