You can take a look at Flex Docs!
Adding flexDirection to a component's style determines the primary axis of its layout.
and then:
Adding alignItems to a component's style determines the alignment of children along the secondary axis (if the primary axis is row, then the secondary is column, and vice versa). 
So your desired code will be:
import React, { Component } from 'react';
import { AppRegistry, View } from 'react-native';
export default class AlignItemsBasics extends Component {
  render() {
    return (
      <View style={{
        flex: 1,
        flexDirection: 'column',
        justifyContent: 'center',
        alignItems: 'center',
      }}>
        <View style={{width: 50, height: 50, backgroundColor: 'powderblue'}} />
        <View style={{width: 50, height: 50, backgroundColor: 'skyblue'}} />
        <View style={{width: 50, height: 50, backgroundColor: 'steelblue'}} />
      </View>
    );
  }
};
// skip this line if using Create React Native App
AppRegistry.registerComponent('AwesomeProject', () => AlignItemsBasics);
UPDATE
If you mean something like this image:

Then I'll suggest you this:
import React, { Component } from "react";
import { View, StyleSheet } from "react-native";
class Playground extends Component {
  render() {
    return (
      <View style={styles.container}>
        <View style={styles.boxes} />
        <View style={styles.boxes} />
        <View
          style={[
            styles.boxes,
            {
              backgroundColor: "crimson",
              position: "absolute",
              right: 0
            }
          ]}
        />
      </View>
    );
  }
}
const styles = StyleSheet.create({
  container: {
    flex: 1,
    flexDirection: "row",
    justifyContent: "flex-start",
    alignItems: "center"
  },
  boxes: {
    width: 50,
    height: 50,
    marginLeft: 1, // to separate each box!
    backgroundColor: "steelblue"
  }
});
export default Playground;
As far as i know with these props, it's the best way!