Final answer:
Greece and Poland are European countries where evidence of migration push factors can be found due to political instability, economic difficulties, and social issues.
Step-by-step explanation:
The European countries where you can find evidence of migration push factors are Greece and Poland. These countries have experienced significant emigration due to various push factors such as political instability, economic difficulties, and social issues. For example, Greece has faced economic challenges in recent years, leading many people to migrate to other European countries in search of better opportunities.