Sweden’s win in the Thirty Years' War changed a lot for its nearby countries after the war. This victory shifted political power in Northern Europe.

1. Land Changes:

   • After the Peace of Westphalia in 1648, Sweden gained control of several areas:
     • Bremen (part of what is now Germany)
     • Pomerania
     • Estonia, Livonia, and parts of present-day Finland

2. Becoming a Great Power:

   • Sweden became one of the top powers in Europe, known for its strong military and smart strategies, especially under King Gustavus Adolphus.
   • At its peak, the Swedish army had around 100,000 soldiers. They were well-trained and organized, setting new standards for how armies should be run.

3. Effects on Neighboring Countries:

   • Countries nearby, like Denmark and Poland, felt more threatened because of Sweden’s growth.
   • Denmark, worried about Sweden's power, started the Second Northern War (1657-1660), which ended with Denmark losing land.
   • Poland-Lithuania got involved in battles with Sweden, which led to major fights and changes in borders.

4. Economic Effects:

   • The war caused a lot of damage in Central Europe, but it helped Sweden take advantage of trade routes and gain control over valuable trade in the Baltic Sea.
   • Sweden's economy grew stronger, making more money from the areas it captured, which helped it gain more influence in European politics.

In short, Sweden's victory had a huge impact on the region, leading to conflicts and changing borders that affected its neighboring countries for a long time.