To develop a food delivery app in the USA, you can follow these steps:

Market Research:

Identify the target audience and their preferences.
Analyze competitors to understand market trends and gaps.
Define Features:

User App:
Registration and login
Search and browse restaurants
Menu with prices, descriptions, and images
Cart and checkout
Payment gateway integration
Order tracking
Ratings and reviews
Restaurant App (optional):
Menu management
Order management
Notifications for new orders
Admin Panel:
User and restaurant management
Analytics and reporting
Offers and promotions management
Choose a Platform:

Decide whether to develop for Android, iOS, or both using native or hybrid frameworks.
Design UI/UX:

Create wireframes and prototypes for a user-friendly interface.
Focus on intuitive navigation and appealing visuals.
Development:

Frontend Development:
Use technologies like React Native (for hybrid) or Swift/Kotlin (for native) for mobile apps.
HTML, CSS, and JavaScript for web interfaces.
Backend Development:
Choose a technology stack like Node.js, Python (Django or Flask), or Ruby on Rails.
Implement features like user authentication, data management, and real-time updates.
Integrate APIs:

Payment gateways (Stripe, PayPal)
Geolocation (Google Maps API)
Push notifications (Firebase Cloud Messaging, Apple Push Notification Service)
Testing:

Perform unit testing, integration testing, and user acceptance testing.
Ensure app performance, security, and compatibility across devices.
Launch:

Publish the app on Google Play Store and/or Apple App Store.
Optimize app store listings with relevant keywords like "food delivery app."
Marketing:

Use digital marketing strategies like SEO, social media marketing, and influencer collaborations.
Offer discounts and promotions to attract users.
Feedback and Iteration:

Gather user feedback through ratings, reviews, and surveys.
Continuously update and improve the app based on feedback and market trends.
Remember, creating a unique and engaging app experience is crucial to stand out in the competitive food delivery market.