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.

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)

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

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

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.