Poland and Lithuania established diplomatic relations from the 13th century, after the Grand Duchy of Lithuania under Mindaugas acquired some of the territory of Rus' and thus established a border with the then-fragmented Kingdom of Poland. The fact that Poland and Lithuania merged voluntarily and fraternally was of vital importance, as evidenced by the Manifestation of the Unity of the Polish-Lithuanian Commonwealth in Horodło. Although held in 1861, as Poland was under partitions at that time, the gathering was attended by 10,000 participants from all over the country. 'Lithuania, my country!' - these words were written by Adam Mickiewicz, a Polish poet and independence activist, in the first half of the 19th century to refer to his homeland. While today, despite much political turmoil and after many years, similar exclamations can still be heard from the 200,000 or so Poles living in Lithuania. This was compounded by the extremely unfavourable geopolitical situation of the Polish-Lithuanian Commonwealth, which, in the first half of the 18th century, was unable to resist the influence of neighbouring states. The potential of the Polish-Saxon Union was not exploited at all. According to him, Poland's favour to Lithuania increased because of our country's declaration that Lithuania would not back potential European Union sanctions on Poland. "This was a truly important step, which helped Poland improve its relations with the European Commission. From the 31 December 2019 to the 21 March 2020, WHO collected the numbers of confirmed COVID-19 cases and deaths through official communications under the International Health Regulations (IHR, 2005), complemented by monitoring the official ministries of health websites and social media accounts. Since 22 March 2020, global data is compiled .

why did poland and lithuania unite