A foreigner's first impression of the United States can vary greatly depending on their background, the specific location they visit first, and their individual experiences. However, some common initial impressions might include:

1. **Size and Diversity**: The vastness of the country and its diverse landscapes (from bustling cities to wide-open rural areas) can be striking.

2. **Cultural Differences**: Differences in social norms, customs, and even everyday behaviors (like tipping culture, queuing etiquette, etc.) may stand out.

3. **Technology and Convenience**: High levels of technological advancement and convenience in daily life, such as widespread use of smartphones and efficient services like home delivery and online shopping.

4. **Language**: While English is predominant, encountering a variety of accents and regional dialects, along with the presence of other languages, especially in urban areas, can be notable.

5. **Food Culture**: The diversity of food options, from fast food chains to international cuisines, can be an eye-opener.

6. **Safety and Security**: Depending on where they visit, perceptions of safety and security might vary. Some areas might seem very safe and orderly, while others might appear more chaotic or have stricter rules and regulations.

7. **Friendliness**: Americans are often perceived as being friendly and welcoming, which can make visitors feel at ease.

8. **Traffic and Driving**: Different driving habits, road conditions, and traffic congestion in major cities might also leave an impression.

9. **Public Services**: Efficiency and availability of public services like healthcare, education, and public transportation can vary widely by location.

10. **Consumerism**: The emphasis on consumer culture and material wealth can be noticeable.

These impressions can evolve over time as the visitor gets to know the country better and experiences more of its nuances.