1) The development of the microprocessor by Intel in 1971 paved the way for the modern computer and led to the exponential growth of computing power.

2) The assassination of Archduke Franz Ferdinand of Austria in 1914 triggered the start of World War I.

3) Online banking and mobile banking have become increasingly popular, providing convenient access to banking services through digital platforms.

4) The Brexit process, initiated by the United Kingdom's referendum in 2016, led to the country's withdrawal from the European Union in 2020, marking a significant political and economic change for both the UK and the EU.