Research shows that speaking a 2nd language can open your mind to different perspectives and new ways to solve problems.
Speaking a different language can actually change our thought patterns. These mindset changes are illustrated in a study of bilingual Mexican Americans where they were given a personality test in both English and Spanish. Participants scored higher in extroversion after taking the test in English. American culture does emphasize assertiveness.
Speaking in a foreign language requires logic to choose the right words and put them in the correct order, sharpening your decision-making and leading to more rational- rather than emotional- choices.