In 1904, the United States and Panama proclaimed a treaty under which the U.S. agreed to undertake efforts to build a ship canal across the Panama isthmus.

Source: https://wtop.com/back-in-the-day/2023/02/today-in-history-feb-26-world-trade-center-bombed-in-1993/

In late 2023, advancing Ukrainian forces were close enough to the narrow isthmus connecting Crimean to the mainland that the only Russian rail line carrying supplies to occupied Crimea was within range of GMLRS missile attacks.

Source: http://www.strategypage.com/htmw/htwin/articles/20231126.aspx

Now Ukrainian forces are getting close to the narrow isthmus that connects Crimean to the mainland and the other access point, the Kerch Strait bridge in southeastern Crimea was also under constant attack.

Source: http://www.strategypage.com/htmw/htwin/articles/20231126.aspx

The 200-km wide isthmus is the narrowest area in Mexico between the Pacific and Atlantic oceans, in the Gulf of Mexico, which has a large indigenous population and is abundant in biodiversity, hydrocarbons and minerals.

Source: https://www.ipsnews.net/2023/03/opposition-mexico-mega-industrial-model/?utm_source=rss&utm_medium=rss&utm_campaign=opposition-mexico-mega-industrial-model